Synthesis of mono-substituted 2,2′-bipyridinesElectronic supplementary information (ESI) available: experimental details and full characterization of new compounds. See http://www.rsc.org/suppdata/cc/b2/b203595b/
Highly Enantioselective Conjugate Addition of Malononitrile to 2-Enoylpyridines with Bifunctional Organocatalyst
作者:Nagaraju Molleti、Nirmal K. Rana、Vinod K. Singh
DOI:10.1021/ol3015607
日期:2012.9.7
An efficient enantioselective conjugate addition of malononitrile to a range of β-substituted 2-enoylpyridines catalyzed by cinchonaalkaloid-based bifunctional urea catalysts has been developed. Both enantiomers of the products could be achieved with the same level of enantioselectivity by using pseudoenantiomeric catalysts in up to 97% ee and in excellent yields. One of the enantioenriched products
Reinvestigation of synthesis of halo-substituted 3-phenyl-1-(2-pyridyl)-2-propen-1-ones (azachalcones). A tandem reaction for formation of penta-substituted cyclohexanols
作者:Chia-Wai Li、Tzu-Hsuan Shen、Tzenge-Lien Shih
DOI:10.1016/j.tet.2017.06.033
日期:2017.8
During the reaction course, we obtained not only the target azachalcones, but also penta-substituted cyclohexanols, which are seldom reported in the literatures. The formation of penta-substituted cyclohexanols was dependent on equivalents of base used and reaction time. Their formation followed a tandem reaction: Claisen-Schmidt condensation, three Michael reactions, retro-aldol reaction, and intramolecular
Design, synthesis, pharmacological evaluation and DNA interaction studies of binuclear Pt(II) complexes with pyrazolo[1,5-a]pyrimidine scaffold
作者:Miral V. Lunagariya、Khyati P. Thakor、Bhargav N. Waghela、Chadramani Pathak、Mohan N. Patel
DOI:10.1002/aoc.4222
日期:2018.4
Substituted pyrazolo[1,5‐a]pyrimidine ligands were synthesized by cyclization, using 3‐(thiophen‐2‐yl)‐1H‐pyrazol‐5‐amine with substituted enones (3‐phenyl‐1‐(pyridin‐2‐yl)prop‐2‐en‐1‐one) in presence of KOH and DMF as solvent to form cyclic aromatic compounds. The substituted pyrazolo[1,5‐a] pyrimidine based binuclear PtII complexes containing neutral tetradentated ligands have general formula [Pt2(5a–5f)Cl4]
Cinchonidine derived squaramide catalyzed Michael addition of pyrazolin-5-ones to 2-enoylpyridines providing chiral molecules bearing two heterocyclic motifs with enantiomeric excess up to 96%.
Cinchona alkaloid derived squaramide catalyzed diastereo- and enantioselective Michael addition of isocyanoacetates to 2-enoylpyridines
作者:Mei-Xin Zhao、Guang-Yu Zhu、Xiao-Li Zhao、Min Shi
DOI:10.1016/j.tet.2019.01.024
日期:2019.3
An efficient organocatalytic diastereo- and enantioselective Michael addition of α-substituted isocyanoacetates to 2-enoylpyridines catalyzed by cinchona alkaloid-derived squaramide has been achieved, affording the corresponding adducts with two adjacent tertiary-quaternary stereocenters in excellent yields (up to 99%) and good to excellent stereoselectivities (up to >20:1 dr, up to 98% ee) under mild